1226636243 has 8 divisors (see below), whose sum is σ = 1407045120. Its totient is φ = 1047521160.

The previous prime is 1226636183. The next prime is 1226636249. The reversal of 1226636243 is 3426366221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1226636243 - 2¹⁰ = 1226635219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226636249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321413 + ... + 325206.

It is an arithmetic number, because the mean of its divisors is an integer number (175880640).

Almost surely, 2^1226636243 is an apocalyptic number.

1226636243 is a deficient number, since it is larger than the sum of its proper divisors (180408877).

1226636243 is an equidigital number, since it uses as much as digits as its factorization.

1226636243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646897.

The product of its digits is 62208, while the sum is 35.

The square root of 1226636243 is about 35023.3670996950. The cubic root of 1226636243 is about 1070.4636657628.

The spelling of 1226636243 in words is "one billion, two hundred twenty-six million, six hundred thirty-six thousand, two hundred forty-three".